remove old benchmarking CI

.github/workflows/ci.yaml

@@ -100,41 +100,6 @@ jobs:
       - name: Test (race + shuffle)
         run: go test -race -shuffle=on -count=1 -timeout=10m ./...
 
-  benchmark:
-    needs: [test]
-    runs-on: ubuntu-latest
-    permissions:
-      contents: read
-    steps:
-      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
-
-      - uses: actions/setup-go@4a3601121dd01d1626a1e23e37211e3254c1c06c # v6.4.0
-        with:
-          go-version: "1.26"
-
-      - name: Run benchmarks
-        run: go test -bench=. -benchmem -count=5 -shuffle=on -run='^$' -timeout=15m ./... | tee bench-results.txt
-
-      - name: Generate benchmark report
-        run: |
-          go run ./internal/benchci -current bench-results.txt -out bench-report.md
-          cat bench-report.md >> "$GITHUB_STEP_SUMMARY"
-
-      - name: Upload generated benchmark report
-        if: github.event_name == 'pull_request'
-        uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a # v7.0.1
-        with:
-          name: bench-report
-          path: bench-report.md
-          retention-days: 30
-
-      - name: Upload raw benchmark results
-        if: always()
-        uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a # v7.0.1
-        with:
-          name: bench-results
-          path: bench-results.txt
-          retention-days: 30
   memci:
     needs: [test]
     runs-on: ubuntu-latest